Rechargeable battery

Abstract

A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case connected to the first electrode to house the electrode assembly and including an opening to expose the electrode assembly; a cap plate coupled with the case to cover an outer region of the opening and including a through-hole to expose a center region of the opening; and a terminal plate connected to the second electrode to be insulated from and bonded to the cap plate, and including a flange part covering the through-hole and a protruded part penetrating the through-hole from the flange part.

1 . A rechargeable battery comprising:
 an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode;   a case connected to the first electrode to house the electrode assembly, and including an opening to expose the electrode assembly;   a cap plate coupled with the case to cover an outer region of the opening and including a through-hole to expose a center region of the opening; and   a terminal plate connected to the second electrode to be insulated from and bonded to the cap plate, and including a flange part covering the through-hole and a protruded part penetrating the through-hole from the flange part,   wherein a ratio of a diameter of the protruded part to a diameter of the flange part is 2/25 to 3/5.   
     
     
         2 . The rechargeable battery of  claim 1 , further comprising: 
 a thermal fusion layer between the cap plate and the flange part and insulatedly bonding the cap plate and the flange part.   
     
     
         3 . The rechargeable battery of  claim 2 , wherein: 
 the thermal fusion layer is melted at a predetermined temperature.   
     
     
         4 . The rechargeable battery of  claim 1 , wherein: 
 the flange part is arranged on the cap plate, and   the protruded part is connected to the second electrode through the through-hole from the flange part.   
     
     
         5 . The rechargeable battery of  claim 4 , wherein: 
 the electrode assembly further includes:   a first electrode tab extending from the first electrode and welded to the case; and   a second electrode tab extending from the second electrode and welded to the protruded part of the terminal plate.   
     
     
         6 . The rechargeable battery of  claim 1 , wherein: 
 the flange part has a wider area than the protruded part.   
     
     
         7 . The rechargeable battery of  claim 1 , wherein: 
 the flange part has a thinner thickness than the protruded part.   
     
     
         8 . The rechargeable battery of  claim 1 , wherein: 
 the flange part and the protruded part are integrally formed.   
     
     
         9 . The rechargeable battery of  claim 1 , wherein: 
 the case and the cap plate have a same polarity as the first electrode, and   the terminal plate has a same polarity as the second electrode.   
     
     
         10 . The rechargeable battery of  claim 1 , wherein: 
 the diameter of the flange part is smaller than a diameter of the case.   
     
     
         11 . The rechargeable battery of  claim 1 , wherein: 
 the ratio of the diameter of the protruded part to the diameter of the flange part is 1/10 to 3/5.   
     
     
         12 . The rechargeable battery of  claim 1 , wherein: 
 the ratio of the diameter of the protruded part to the diameter of the flange part is 1/10 to 1/2.   
     
     
         13 . The rechargeable battery of  claim 1 , wherein: 
 the ratio of the diameter of the protruded part to the diameter of the flange part is 1/10 to 1/3.   
     
     
         14 . The rechargeable battery of  claim 1 , wherein: 
 the rechargeable battery includes a coin-type cell or a button-type cell.   
     
     
         15 . The rechargeable battery of  claim 14 , wherein: 
 a ratio of a height to a diameter of the coin-type cell or the button-type cell (height/diameter) is 1 or less.   
     
     
         16 . A rechargeable battery, comprising: 
 an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode;   a case connected to the first electrode to house the electrode assembly, and including an opening to expose the electrode assembly;   a cap plate coupled with the case to cover an outer region of the opening and including a through-hole to expose a center region of the opening; and   a terminal plate connected to the second electrode to be insulated from and bonded to the cap plate, and including a flange part covering the through-hole and a protruded part penetrating the through-hole from the flange part,   wherein a ratio of a diameter of the protruded part to a diameter of the flange part is 2/25 or more.   
     
     
         17 . The rechargeable battery of  claim 16 , wherein: 
 the ratio of the diameter of the protruded part to the diameter of the flange part is 3/5 or less.   
     
     
         18 . The rechargeable battery of  claim 16 , wherein: 
 the ratio of the diameter of the protruded part to the diameter of the flange part is 1/2 or less.   
     
     
         19 . The rechargeable battery of  claim 16 , wherein: 
 the ratio of the diameter of the protruded part to the diameter of the flange part is 1/3 or less.